Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Andrey Drobyshev's qemugdb script improvements and my --device
scsi-block,migrate-pr=on|off live migration support for SCSI Persistent
Reservations.

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* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  docs: add SCSI migrate-pr documentation
  scsi: save/load SCSI reservation state
  scsi: track SCSI reservation state for live migration
  scsi: add error reporting to scsi_SG_IO()
  scsi: generalize scsi_SG_IO_FROM_DEV() to scsi_SG_IO()
  scripts/qemugdb: coroutine: Add option for obtaining detailed trace in coredump
  scripts/qemugdb: timers: Improve 'qemu timers' command readability
  scripts/qemugdb: timers: Fix KeyError in 'qemu timers' command
  scripts/qemugdb: mtree: Fix OverflowError in mtree with 128-bit addresses

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>